THE GIANT TRILOBITE OF MOOSE RIVER. 65 
toxide mixed with the peroxide and clay slate. The walls of the 
bed are of the same, or nearly the same date with the bed of the 
ore, for they are filled with terebratulze.” 
In a communication recently made to the Geol. Soe., 
London, by J. Prestwich, Jr., Esq., “On some of the faults which 
affect the coal field of Coalbrookdale,”’ the author concludes his 
memoir with some observations on the fossils he procured, prin- 
cipally from the iron stone of the coal measures; among the 
most remarkable were the remains of some trilobites, hitherto 
undescribed. They were procured from a bed of ironstone in 
the centre of the coal measures. No description of these animals 
being to my knowledge, yet given, it is impossible to say what 
affinities they may have to our Asaphus crypturus. Mr. Prest- 
wich, who notices a Coleopterous insect, and another apparently 
belonging to the genus Aranw, which were obtained from the 
ironstone nodules. The occurrence of these different races of 
animals in the same formation is certainly a very curious and 
highly important fact. 
